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hmm… okay, this pump should not be able to flow more than one of these drains in a typical installation…All the drains
are 1 inch. The pump is a simplicity DC 1000.
This points towards restriction in your primary drain plumbing, either from a clog, or from a fitting with an undersized inside diameter…
From your video, it appears that something’s going on with that primary drain’s first fitting; its inside diameter looks appreciably smaller than the secondary drain’s first fitting! — is that just the bulkhead itself on the primary drain?
